| abstract |
This production method includes a drying step in which a granular dried substance is obtained by using a heating device to dry a particulate hydrous gel-like crosslinked polymer obtained by polymerizing a monomer which is a starting material of a water-absorbing resin. The heating device is provided with: a rotating container which accommodates the particulate hydrous gel-like polymer therein and rotates; and a plurality of heating pipes which are positioned inside the rotating container, extend in the axial direction of the rotating container, and rotate in conjunction with the rotating container. The gel temperature of the particulate hydrous gel-like crosslinked polymer provided in the drying step is 50˚C or higher as measured using a contact thermometer. |